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1943: Geological surveys and exploratory drilling reveals that Saskatchewan has one of the largest potash deposits in the world.
1951: First commercial production potash mine is attempted by Western Potash Corporation Limited in the Unity district. Numerous delays and flooding make the project unsuccessful.
1958: Potash is first produced by Potash Company of America (PCA) near Saskatoon. The mine floods the next year and does not return to production until 1965.
1960: 1970: Potash production in Saskatchewan has been continuous since 1962: Ten mines are built in Saskatchewan for less than $300 million by six different companies. Referenced by: company name, location (year of initial production). Potash Company of America, Saskatoon (1958); International Minerals and Chemical Corporation (IMC), Yarbo K-1 (1962); Kalium Chemicals Limited, Belle Plaine (1964);
IMC, Gerald K-2 (1967); Allan Potash Mines, Allan (1968); Duval Corporation of Canada, Saskatoon (1968); Alwinsal Potash of Canada Limited, Guernsey (1968); Central Canada Potash, Colonsay (1969); Cominco Ltd., Vanscoy (1969); Hudson Bay Mining and Smelting Co. Limited, Rocanville (1970).